Chuck.



A. I. JACOBS.v

CHUCK.

APPLICATION FILED SEPILIQ, 1912.

15,193,511 Patented Jan.5,1915.

time.

ARTHUR I. JACOBS, OF HARTFORD, CONNECTICUT, ASSIGNOR.TO THE JACOBS MANU- FACTURING COMPANY, A CORPORATION OF CONNECTICUT.

CHUCK.

Maasai..

Specification of Letters Patent.

Patenten aan. a, fait.

Application led September 19, 1912. Serial No. 721,114.

To all whom 'it may concern:

Be it known that I, ARTHUR I. JACOBS, a citizen of the United States, residing at Hartford, in the -county of Hartford and l State of Connecticut, have invented certain new and useful Improvements in Chucks, of

- which the following is a specification.

the provision of a simple means by whichv the jaws may be adjusted more rapidly to- -v ward or from each other, than is possible with any other existing chuck of this type.

Second, the provision of effective anti-frio' tion means whereby the maximum eiiciency of the jaws will be attained with a minimum amount of applied force., and at the same time prevent the possibility of the balls, or

equivalent devices getting into the jaw receiving channels.

In the drawing accompanying and forming part of the presentmspecification I have shown in detail one convenient form of embodiment of the invention, which to enable those skilled in the art to practice said invention will be set forth fully in the following description, while the novelty of the invention will be included in the claims succeeding said description. From this it will be evident that I do not restrict myself to the disclosure made by said drawings and description; I may depart therefrom in 'several respects within the scope of the invention included in said claims.

Referring to said drawings: Figure 1 is a side elevation of a chuck involving my in vention. Fig. 2 is a sectional View of the same, and Fig. 3 is a developed view of the jaw actuating nut. l

Ilike characters refer to like parts throughout the several figures.

The bodyof the chuck is designated by 5, and is preferably of casehardened steel, having the usual socket 6 serving the customary function. Said body has exteriorly thereof several forwardly-converging channels 7 in which are fitted for longitudinal sliding movement the jaws 8. Surrounding the said jaws is a split nut 9 fitted within and rigidly connectedrwith the sleeve 10, rotatively disposed in the channel 10 and immovable in the direction of its axis of rotation. The nut 9 is in threadedl engagement with the' jaws 8. It, therefore, follows that when the sleeve 10 is rotated in one direction, the nut 9 will be correspondingly turned and will move the jaws 8 for- -Ward and simultaneously, 'owing to the angular disposition of the channels or grooves 7, cause the jaws 8 to approach or advance, and that on opposite movement of said "sleeve, the jaws are caused to recede. 'The f fr ontedge of the sleeve 10 is shown equipped with teeth l1 adapted to be engaged by the b'vel 'pinion 12 rigid with the key 13, the or v'journal end of which is adapted or'fremovable reception in one of the several openings 14: in the chuck body 5 forward of the sleeve 10.

The foregoing, except as to the casehardened body, is a vbrief description of a chuck of sleeve type, in which I have chosen to show my invention.-

In a chuck ofthe character indicated it is necessary -at times to adjust the jaws av considerable distance either toward or from each other, for instance after the chuck has engaged a comparatively large sized piece of stock, drill or tool, it may be necessary for it to hold a much smaller piece or forsome other reasons, it may ,be required to move the jaws from probably the `maximum span to the minimum or relatively so, and ofcourse rapidity in effect ing such action is of importance. I provide meanswhereby the jaws can be very quickly adjusted, and this I secureby forming upon l the-nut 9 a multiple thread, and although this multiple thread may vary, it is shown as being of triple form, the three threads being represented in Fig. 3 and being denoted by 15, 16 and 17 respectively. The

threads on the jaws 8 are similarly formed or match those of the nut. While, as I indicate, a triple or three thread construction is desirable, it is not imperatively necessary, the invention residing rather in a plurality of threads, by reason of which the rapid adjustment of the jaws can be assured. Preferably, therefore, the multiple of the threads of said nut conforms to the number of jaws, by virtue of which interchangeability of said jaws is accomplished. For example,

in the illustration thel jaws are. three in number, and although the threadof the nut is triple it mightbe sextuple.

lthe body, although as I indicate sucha construction is advantageous in that easy action 1s1nsured. f

The rear edge of the nut 9 has a substantially circular race 18, and in said race are fitted several balls 19 which also-find a bearing against the wall 20 of the annular groove 10. It willbe observed that the groove 10 opens into the l'jaw receiving channels 7 and that the nut'9 or the wall of the race 18, -overhangs the balls 19 to such an extent that when the jaws 8 are in their extreme forward positions or at a .j point' forward of the rear surface of the nut-1r 9, said overhanging portion of the nut will act to prevent positively the balls rolling into Vthe said channels 7. What I claim is:

1. A chuck comprising a body having an annular groove between theends thereof and also having forwardly-converging channels opening into said groove, jaws longitudinally slidable in said channels, a nut rotatively mounted in said groove andhaving a feed connection with said jaws, and antifriction devices betweenl the nut and the chuck body, said nut having means for'preventing positively said anti-friction dev1ces falling into said channels.

2. A chuck comprising a body having an annular groove between the ends thereof and also having forwardly-extending channels opening into said grooves, jaws longitudinally slidable in said channels, a rotary nut in said groove and provided with a ball race, balls fitted '-in said race and bearing vagainst the body, the wall of. said race overhanging the balls to thereby prevent their entering said channels.

i In testimony whereof I aiix my signature in presence o two witnesses.

ARTHUR I. JACOBS. Witnesses:

HEATH SUTHELLAND, JOSEPH R. BARLOW. 

